1 /* $NetBSD: uvm_coredump.c,v 1.9 2025/08/10 19:49:39 andvar Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Charles D. Cranor and Washington University. 5 * Copyright (c) 1991, 1993, The Regents of the University of California. 6 * 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * The Mach Operating System project at Carnegie-Mellon University. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)vm_glue.c 8.6 (Berkeley) 1/5/94 37 * from: Id: uvm_glue.c,v 1.1.2.8 1998/02/07 01:16:54 chs Exp 38 * 39 * 40 * Copyright (c) 1987, 1990 Carnegie-Mellon University. 41 * All rights reserved. 42 * 43 * Permission to use, copy, modify and distribute this software and 44 * its documentation is hereby granted, provided that both the copyright 45 * notice and this permission notice appear in all copies of the 46 * software, derivative works or modified versions, and any portions 47 * thereof, and that both notices appear in supporting documentation. 48 * 49 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 50 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 51 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 52 * 53 * Carnegie Mellon requests users of this software to return to 54 * 55 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 56 * School of Computer Science 57 * Carnegie Mellon University 58 * Pittsburgh PA 15213-3890 59 * 60 * any improvements or extensions that they make and grant Carnegie the 61 * rights to redistribute these changes. 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: uvm_coredump.c,v 1.9 2025/08/10 19:49:39 andvar Exp $"); 66 67 /* 68 * uvm_coredump.c: glue functions for coredump 69 */ 70 71 #include <sys/param.h> 72 #include <sys/systm.h> 73 #include <sys/proc.h> 74 75 #include <uvm/uvm.h> 76 77 /* 78 * uvm_coredump_walkmap: walk a process's map for the purpose of dumping 79 * a core file. 80 * XXX: I'm not entirely sure the locking is this function is in anyway 81 * correct. If the process isn't actually stopped then the data passed 82 * to func() is at best stale, and horrid things might happen if the 83 * entry being processed is deleted (dsl). 84 */ 85 86 int 87 uvm_coredump_walkmap(struct proc *p, int (*func)(struct uvm_coredump_state *), 88 void *cookie) 89 { 90 struct uvm_coredump_state state; 91 struct vmspace *vm = p->p_vmspace; 92 struct vm_map *map = &vm->vm_map; 93 struct vm_map_entry *entry; 94 int error; 95 96 entry = NULL; 97 vm_map_lock_read(map); 98 state.end = 0; 99 for (;;) { 100 if (entry == NULL) 101 entry = map->header.next; 102 else if (!uvm_map_lookup_entry(map, state.end, &entry)) 103 entry = entry->next; 104 if (entry == &map->header) 105 break; 106 107 state.cookie = cookie; 108 if (state.end > entry->start) { 109 state.start = state.end; 110 } else { 111 state.start = entry->start; 112 } 113 state.realend = entry->end; 114 state.end = entry->end; 115 state.prot = entry->protection; 116 state.flags = 0; 117 118 /* 119 * Dump the region unless one of the following is true: 120 * 121 * (1) the region has neither object nor amap behind it 122 * (ie. it has never been accessed). 123 * 124 * (2) the region has no amap and is read-only 125 * (eg. an executable text section). 126 * 127 * (3) the region's object is a device. 128 * 129 * (4) the region is unreadable by the process. 130 */ 131 132 KASSERT(!UVM_ET_ISSUBMAP(entry)); 133 #ifdef VM_MAXUSER_ADDRESS 134 KASSERT(state.start < VM_MAXUSER_ADDRESS); 135 KASSERT(state.end <= VM_MAXUSER_ADDRESS); 136 #endif 137 if (entry->object.uvm_obj == NULL && 138 entry->aref.ar_amap == NULL) { 139 state.realend = state.start; 140 } else if ((entry->protection & VM_PROT_WRITE) == 0 && 141 entry->aref.ar_amap == NULL) { 142 state.realend = state.start; 143 } else if (entry->object.uvm_obj != NULL && 144 UVM_OBJ_IS_DEVICE(entry->object.uvm_obj)) { 145 state.realend = state.start; 146 } else if ((entry->protection & VM_PROT_READ) == 0) { 147 state.realend = state.start; 148 } else { 149 if (state.start >= (vaddr_t)vm->vm_maxsaddr) 150 state.flags |= UVM_COREDUMP_STACK; 151 152 /* 153 * If this an anonymous entry, only dump instantiated 154 * pages. 155 */ 156 if (entry->object.uvm_obj == NULL) { 157 vaddr_t end; 158 159 amap_lock(entry->aref.ar_amap, RW_READER); 160 for (end = state.start; 161 end < state.end; end += PAGE_SIZE) { 162 struct vm_anon *anon; 163 anon = amap_lookup(&entry->aref, 164 end - entry->start); 165 /* 166 * If we have already encountered an 167 * uninstantiated page, stop at the 168 * first instantiated page. 169 */ 170 if (anon != NULL && 171 state.realend != state.end) { 172 state.end = end; 173 break; 174 } 175 176 /* 177 * If this page is the first 178 * uninstantiated page, mark this as 179 * the real ending point. Continue to 180 * counting uninstantiated pages. 181 */ 182 if (anon == NULL && 183 state.realend == state.end) { 184 state.realend = end; 185 } 186 } 187 amap_unlock(entry->aref.ar_amap); 188 } 189 } 190 191 vm_map_unlock_read(map); 192 error = (*func)(&state); 193 if (error) 194 return (error); 195 vm_map_lock_read(map); 196 } 197 vm_map_unlock_read(map); 198 199 return (0); 200 } 201 202 static int 203 count_segs(struct uvm_coredump_state *s) 204 { 205 (*(int *)s->cookie)++; 206 207 return 0; 208 } 209 210 int 211 uvm_coredump_count_segs(struct proc *p) 212 { 213 int count = 0; 214 215 uvm_coredump_walkmap(p, count_segs, &count); 216 return count; 217 } 218
Indexes created Sat Sep 20 22:09:52 GMT 2025